Rumors aplenty have been swirling about AMD's new HD 5900 series but NVIDIA hasn't been sitting on their laurels either. In order to preempt the release of AMD's upcoming flagship products, a new GeForce branded card is being introduced today. Dubbed the GTX 580, it uses a newly tweaked GF110 core along with higher clock speeds than the GTX 480 and the result is a class-leading card that dominates the single GPU landscape.